Hi is there any way to align the thumbs (vertically) so they appear more centred. See image.
They are already centred. The issue there is that the Windows drive icons are themselves bottom aligned, with lots of blank space at the top of them. You should see the same thing in any program that shows those icons (at that size).
You can change the icons if you don't like that.
Thanks, can you tell me how to change them please.
One method is here. Note that this is about changing drive icons in Windows, and isn't specific to Opus.